Radio telephone system



Sept. 15, 1925. 1,553,329

F. M RYAN RADIO TELEPHONE SYSTEM Filed Aug. 14, 1924 2 Sheets-Sheet 1 Sept. 15, 1925. 1,553,329

F. M. RYAN RADI O TELEPHONE SYSTEM 14, 1924 2 Sheets-Sheet 2 F'dZ Filed A Awe/7 for F d/id/b/f Ryan W Af/j/ Patented Sept. 15, 1925.

UNITED- STATES PA FRANCIS M. RYAN, or msr ORANGE, NEW JERSEY, Assicmon ro'wnsrnnn nnncrn c COMPANY, INCORPORATE), OF NEW YORK, N. Y., A. CORPORATION OF NEW YORK.

RADIO TELEPHONE sYsTEn.

Application filed August 14, 1924. Serial No. 731,905.

To all whom it may concern. I

Be it known that'I, FRANCIS M. RYAu, a citizen of the United States of America, residing at East Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Radio Telephone Systems, of which the following is a full, clear, concise, and exact description. I

. This invention relates to a radio telephone system and more particularly to a system including an antenna circuit adapted to be connected to the raido transmitting and receivingig apparatus by a switch mechanism controlled from any one of a number of po sitions-included in a. telephone system, the.

different subscribers or substations of which also may be interconnected for local communications.

Systems of this type heretofore proposed included means whereby an operator can connect any one or more subscribers or substations of the telephone system with the radio apparatus and its associated switching mechanism for communicating thereover with a distant station and can supervise the.

connection so established. In these systems the telephone transmitters and receivers for the different substations are respectively connected by independent circuits to the radio transmitting and receiving apparatus.

In commercial systems, it has often been the practice, in order to prevent interference between outgoing. and incoming energy, to space the transmitting antenna of a radio system some distance, i. e., a fraction of the operating wave length, from the receiving antenna. Under certain conditions, as on board ships or aeroplanes, such disposition of the antenna is impossible. Again, under certain topographical and climatic conditions where a limited number of subscribers are to be served, wire lines are impossible to establish and maintainbecause of the great expense involved.

Under these conditions, systems of the type described above are especially desirable because they may be installed in a limited space and are economical to manufacture and operate, compared with full duplex systems. However, they possess a marked disadvantage in that intercommunication be tween subscribers local to the telephone exchanges is impossible.

The present invention provides an arrangement which possesses all the advantages of systems of this typehitherto pro posed, which permits connections between local subscribers to be made. j

One object of this invention is to provide a radio telephone system including a transmit-receive switch in which any number of local communications and communication over a radio link may be maintained inde pendently of each other.

An understanding of the invention, both as to its organization and method of operation, may be had by reading the following specification in conjunction' with the attached drawing, in which Figs 1 and 2 illustrate a system embodying the invention. In reading the drawing, Fig. 2 should be placed at the right of Fig. 1 with the corresponding conductors in line with each other.

The system to be hereinafter described comprises an antenna, A, a radio transmitting. apparatus T, a .radio receiving ap aratus R, a switch S, adapted to be control ed by a relay OR, a switchboard, an operators set OS, and any number of substations.

As specifically shown in the drawing, the system consists of ,an operators set OS, associated with a switchboard and two substations D and E connected to theswitchboard by appropriate lines L, and L The switchboard is provided with three interconnecting links 1, 2 and 3, control keys for establishing the desired connections, the necessary call and supervisory apparatus, ringing and monitoring keys, and batteries forsupplying energizing current to the system.

-While but two substations and associated switchboard apparatus are illustrated, it is intended. as indicated .by extending the switchboard to the right in Fig. 2, that the system may include any number of substations.

Although the switchboard is shown as provided with three interconnectin links, it is to be understood that any num r of such links may be used.

The radio transmitteg comprises any well known apparatus provided with means for producing a carrier wave, for modulating the wave in accordance with speech currents and supplying the modulated wave to the antenna A. A typical example of an arrangement which may be used for this purpose is shown in .U. S. Patent No. 1,442,147, J n y 923, to B. A. Heising.

Any well known radio receiving apparatus may be used which is adapted to demodulate the incoming high frequency wave and supply the resultant speech currents to 6 the circuit 4.

Beside the links 1, 2 and 3, the switchboard apparatus comprises call signal devices, for example, lamp 5, 5", etc., for each substation; supervisory signal devices sueh as lamps6, 6", 6"; batteries 7', 7",, 7"; and speech retard coils 8, 8", 8", r ectively associated with the links 1, 2 a 3;

interconnecting keys or switches 9, 9 and; 9

for connecting the operators set and the lines L and L to the iinksl, 2 and 3 radio connecting keys or switches 10, 10 and 193' for connecting the links 1, 2 and 3, respectively, to the radio transmitting and -receiv ing apparatus; a ringing key 11 for each! substation and a monitoring key 12 for the:

' operators set. 1 1

The operators set and". the telephone sets at the difi'erent substations are each provided with a key or switch 1 3- for controlling the operation of the antenna switch relay CR. Detailsof the apparatus of the operators setand one substation are shown. However, the apparatus associated with each of the substations is the same With the system otherwise: idle, the operator may listen for calls from) distant'radio stations by removing his receiver from the switchhook and actuating the: interconnect- 7 ing key and radio connecting associated with any one. of switchboard links 1, 2 or 3.

Let it be assumed that he uses link 1. The. switch 9* will be actuated titconnect the operators. set to link. 1 and key 10 will be? operated to connect link 1 to the rad o apparatus. The operators recerwer will be. thereby connected to the circuit 4 as fol lows: from the terminals of the receiver 141, conductors 15, contacts 16 and 1.6 of switch 9, conductors 17 of link 1, contacts 113 of switch 10, to the circuit 4.

A circuit for actuating the relay GR is also prepared as follows: from the movable contact of the switch 13, conductor 24, contacts 25 of switch 9, conductor 26, contacts 27 of switch 10, relay CR and batteryto ground. The energizing circuit for the relay CR will be completed, through ground when the switch 13 is closed.

With the switch 9 closed, the operators transmitter is energized over the following circuit: from the battery 7', right hand'winding of the retard ,COll. 8, conductor 19, contacts20 of switch 9,'conductor 21, transmitter 22, upper pair of contacts $0 of switch hook, monitoring key'l2, contacts 23 of switch 9, conductor 24, and right-hand winding of coil 8' to ground.

Suppose that the operator receives a request from a distant" radio station for connection to a definite substation. To reply,

, tion.

the operator closes his switch 13 to energize the relay OR. The antenna switch S is moved to the right to connect the radio transmittingv apparatus to the antenna cirouit. The operators talking circuit 1924 is connected over contacts 28 and 29 of switch 10 to the radio transmitter, whereby he may communicate with the distant sta- Having advised the distant station operator that the call has been received and will be given attention, he then proceeds to call and connect the desiredi substation to the radio a paratus.

Assume et the call is for substation D. The operator restores switch 10 to normal sition and operates ringing key 11 as.- signedto this substation. Ringing current is supplied by battery 30 over the following circuit :"from: upper terminal of-battery 30, through the right-hand contact of key 11;, conductor 3 B of L bell, contacts 32 associated with switchhook, conductor 33 oil line L,, left hand contact of key 11 and ground tothe other terminal of battery 30.

The operator having operated key 9" of substation D to connect line L, to the. link 1, is ready to communicate with the called party.v Upon the latter removing, his receiver 14 from the switchhook there will be established for his telephone apparatus and control key 13,,ci rc1mits: similar to that described above tor the operators: set. Thus, with the ringing; key in normal position, the telephone receiver bf substation D will be. connected to the conductors: 17-17 as fiolilowsz from the right-hand terminal oft receiver-'14,, conductor 31],, right-handi miserable contact of ringing key 111, its asso stafiienary contact, and contactsltii orfikey 9' assigned to, this station to'the lnwer condiuctor 17, and to; the other (uppeg) conductor 17 fnom the left-hand terminal oi the receiving. upper pair of contacts associated wit-lb. the switchhook, conductor 33, left-hanrli! movable contact of ringing key 11 associated, stationary contact, and contacts 16 of liey'Q;

The transmitter of station D will be connected to the conchrctors- 19 and 24 and to the'battery 7' and retardeoil 8' as follows. from the upper terminal of transmitter 22, conductor 34 of line-L the right-hand inner contacts of switches 9 and 9 in series to contacts 20 and conductor 19, from conductor 24throug-h contacts 23 of switch 9, the left-hand central contacts of switches 9 and 9", conductor 42 to the lower pair of contacts aaociated with-the switchhook, now closed, to the lower terminal of transmitter22.

Key 13 of substation Dis connected to conductor 26 through contacts 25 of switch 9 for substation D. As described above,

conductor 26 is connected by contacts 27 to the antenna switch control relay CR, Thus,

operated the control of the-radio system has been extended to substation D.

Operation of the switch 9 of substation D prepares a supervisory circuit from battery 35, through lamp 6, armature of retard coil 8', conductor 36, contacts 37 of switch 9 to ground and thence back to battery 35. However, the set at substation D being connected for communication, the coil 8' will be energized, its armature will be retracted and-lamp 6 will not be lighted.

The receiver circuit 1717 and the transmitter circuit 19-24-' are connected by a condenser 38 and strap 39, associated with the central contacts of switch 10, which is in idle or non-operated position. In. this position, the condenser-strap connection serves to transmit speech currents, originated at the operators position or 'atsubstation D from the circuit 1924 to the circuit 17-17, whereby the operator may communicate with the subscriber at station D. The switch 10 being in normal position, the telephone, circuit is not connected to the radio system.

Having advised the subscriber at station D that there is a call on the radio system, the operator actuates switch 10 to connect link 1 to the radio system. By closing and releasing switch 13 at station D, the subscriber may operate the transmit-receive switch S to the transmitting or receiving position in accordance with his desire to talk or listen.

Preferably, the tuning and gain adjust- 40 ing apparatus for the radio system will be controlled by the operator. Any wellknown a paratus may be used for this purpose. l-flwever, since this apparatus does not constitute a feature of the present invention, it is not illustrated.

ln order to monitor the conversation and keep the radio apparatus tuned and adjust-.

ed, the operator places his switch 9 in operated position to connect his set to link 1 and simultaneously operates his monitoring key 12, whereby his microphone 22 is opencircuited.

Upon restoring the monitoring key 12 to normal or idle position, the operator mav talk to either the subscriber at station D or the distant radio station. When the sub scriber using the radiosystem completes hi conversation and hangs up his receiver, the retard coil 8 is deenergized, its armature falls back and completes the supervisory circuit over the conductor 36. and lamp 6' is lighted. The operator noting that lamp 6' is lighted, restores to normal position switch 9, associated with station D, whereby the subscribers set is disconnected from the radio system. The key 10" and switch 9, associated with the operators set, being in position, the operator can listen for calls om distant stations.

In a manner similar to that described above, any other subscriber may be connected to the radio system over link 1, 2 or 3, by operating the appropriate key, 9,9 or 9 and key 10, 10 or 10*.

Any number of substations D, E, etc., may be simultaneously connected to the radio system over link 1, 2 or 3, by operating keys 9, 9 or 9 of the different stations, and key 10, 10 or 10 corresponding to the link which is being used. In this case, of course, the connected subscribers must arrange among themselves which one is to control the radio transmit-receive switch, in order to avoid confusion.

A subscriber at any substation, desiring to communicate with a distant radio station or another local subscriber, removes his receiverfrom the switchhook and thereby establishes a circuit through the call lamp which is assigned to the calling station.

Assuming that the call is initiated from substation D and that link 1 is being used to connect one of the additional stations, not shown, to the radio system, the calling lamp 5! will be energized. over the following circuit: from the battery 40, through relay 4.1, right-hand central contact of switch 9, which is idle, right-hand central contacts of switches 9 and 9 also idle, conductor 34, microphone 22, the lower pair of contacts associated with the switchhook, conductor 42, the left-hand central contacts of switches 9 9 and 9 to ground, and back to battery The operator observing that lamp 5 is lighted, connects his set and that of the subscriber to one of the idle links 201 3, for example link 3, by actuating interconnecting key 9 associated with both positions.

The receivers will be connected across conductors 17-17 of link 3, 'the transmitters across conductors 19 and 24 of link 3 to battery 7 and retard coil 8", and the transmitter and receiver circuits 1924, 17-17, will be connected together for speech current transmission by the condenser 38 and strap 39 of key 10".

Suppose the subscriber at D desires to talk to a subscriber at substation E. Upon being informed that a connection to substation E is desired, the operator actuates ringin}: key 11 assigned to station E, and the bell at this station is energized over a circuit similar to that traced above for the bell at substation D.

Key!) assigned to station E is then actuated to connect the substation set to the. interconnecting circuit comprising conductors 17-17, 19-24, condenser 38 and strap 39.

A supervisory'circuit, similar to that previously described, is also, prepared. Upon completion of the conversation, and replacement of either telephone receiver up on its hook, a supervisory circuit will be completed through lamp 6". Observing that lamp 6 is lighted, the operator restores keys 9 to their idle positions and the whole apparatus so far as this connection is concerned simultaneously established as there are inter-- connecting links on the switchboard. Again, the control circuit for the transmit-receive switches of the radio system may be extended to all substations of the system. I

\Vhilein the foregoing but one arrangement and specific details have been described, in order to clearly and completely disclose the nature of the invention, it is to be understood that this invention is not limited thereto but only by the scope of the attached claims.

lVhat is claimed is:

1. A signaling system comprising a transmission circuit, a transmitting apparatus, a

receiving apparatus, a switch adapted in one position to connect said transmitting apparatus to said circuit and in another position to connect said receiving apparatus to said circuit, a circuit whereby the position of said switch may be controlled, a pluralit of substations, a controller for the switcii control circuit at each substation, means for connecting 'one of said substations to said transmitting and receiving apparatus and for extending the switch control circuit to said controller, said means being also adapted to connect said substations together inde pendently of said transmitting and receivmg apparatus.

2. A signaling system comprising a transmission circuit, a transmitting apparatus, a receiving apparatus, a switch adapted in one actuating the oper-.

position to connect said transmitting apparatus to said circuit and in another positlon to connect said receiving apparatus to said circuit, a circuit for controlling the position of said switch, a plurality of substations, a controller for said switch at each substation, a plurality of connecting means, one of which is adapted to connect one of said substations to said transmitting and receiving apparatuses and to extend the switch control circuit to said controller, and others of which are adapted to interconnect; said substations independently of said apparatuses.

3. A radio signaling system comprising an antenna, a radio transmitting apparatus, a radio receiving apparatus, a transmit-receive switch adapted in one position to connect said transmitting apparatus tosaid antenna and in another pos1tion to connect said re-. ce1v1ng apparatus to said antenna, a relay for actuating said switch, a control circuit for said relay, a plurality of substations, a controller for said relay at each substation,

aswitchboard including means for interconnecting said substations for local communications or for connecting a selected substation to said radio apparatus for communication with a distant station, said means including means for connecting said relay control circuit to the controller at the selected substation.

4:. Aradio telephone system comprising an antenna, radio transmitting apparatus, radio receiving apparatus, a transmit-receive switch: adapted in one position to connect said transmitting apparatus to said antenna and in the other. position to connect said receiving apparatus to said antenna, a relay for said transmit-receive switch, a'control circuit for said switch including a relay, a plurality of substations, a switchboard provided with switching means for connecting a selected substation to said radio apparatus and a control .key to said relay circuit, and switching means for interconnecting other substations for local communications.

In witness whereof I hereunto subscribe my name this 11th day of August, A. D.,

FRANCIS M. RYAN. 

